Expressing "to accompany" with 陪同 and 伴随
陪同 and 伴随 have the same meaning, but differ slightly in usage.
The verb 陪同
陪同 
indicates that one person keeps another person company.
indicates that one person keeps another person company.Examples
他陪同我们去机场了
He accompanied us to the airport
tā péitóng wǒmen qù jīchǎng le
那次旅行他由妻子陪同
He was accompanied by his wife on that trip
nà cì lǚxíng tā yóu qīzi péitóng
陪同她的那两个人是谁呢？
Who are the two people accompanying her?
péitóng tā de nà liǎng ge rén shì shéi ne
The verb 伴随
伴随 indicates that one action or phenomenon is accompanied by another. For example, "the disease is accompanied by symptoms".
indicates that one action or phenomenon is accompanied by another. For example, "the disease is accompanied by symptoms". Pay attention
伴随 is often followed by the particle 着 to indicate the duration of an action.
to indicate the duration of an action.Examples
这种病通常伴随有高血压
The disease is usually accompanied by high blood pressure
zhè zhǒng bìng tōngcháng bànsuí yǒu gāo xiěyā
他的行动伴随着一串冗长含糊的独白
His actions were accompanied by a long and tedious speech
tā de xíngdòng bànsuízhe yí chuàn rǒngcháng hánhú de dúbái
这个伤疤将伴随他的一生
He'll be scarred for life
zhè ge shāngbā jiāng bànsuí tā de yìshēng
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